a gun operated by compressed air. Historical Examples He gets a bunch of things—an air gun, and a train that goes around when you wind her up. The Children’s Book of Christmas Stories Various He had owned the air gun two weeks now, and he hadn’t killed a thing. Frank of Freedom Hill Samuel A. […]

noting any metal, especially alloy steel, that can be hardened from above its transformation point by cooling in air. noun a process of hardening high-alloy steels by heating and cooling in a current of air Compare oil hardening

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